Autumn corn has a short growing period and is vulnerable to drought, high temperature, low temperature at the late stage and threat from diseases and insect pests. It will cause small ears and even severe bald tops and lack of grains. Therefore, special attention should be paid to the management of fertilizers and pests and diseases during management.
Apply fertilizer for jointing. Autumn corn generally begins jointing one month after sowing, and requires fertilizer early. It can be applied twice at the jointing stage and during the big bellmouth stage, and the joint fertilizer is applied at 4 to 5 leaf stages, and 5 kg of urea and potassium fertilizer can be applied at the same time. 5 kg, promote seedling growth and robust.
Heavy ear fertilizer. About 35 days after the emergence of autumn corn, heavy ear fertilizer effect is the best, can be used per acre 10 to 15 kg of urea, or ammonium bicarbonate 35 to 40 kg, or 45% of compound fertilizer 20 kg, open a hole deep in the root side. In case of autumn and dry weather, fertilization should be combined with watering or furrow irrigation to promote drought and rapid decomposition of fertilizer. At the beginning of the heading (male), combined with removal of 1/3 of the total male flowers in the field, try to make the ear have sufficient nutrient supply.
Suitable for granulation. The role of flower pellets is to raise the roots to protect the leaves, prevent premature corn aging, in order to extend the functional period of the late green leaves and increase grain weight. The grain fertilizer should be applied lightly and skillfully, and the amount of fertilizer should account for about 10% of the total amount of fertilizer. Insufficient panicle fertilizer, defertilization occurs, as well as early yellow-green leaves above the ear section, lower leaves early, granular fertilizer can be applied more than appropriate; the contrary can be less or not applied. The application of granulation fertilizer should be after tasseling, flowering and silking period, depending on the corn growth, urea per acre of 5 ~ 7.5 kg.
Prevent pests and diseases. In addition to reasonable fertilization, the prevention and control of pests and diseases is also an important aspect of the autumn corn crops. During the seedling stage, they prevent and control corn borer, armyworm, and armyworm pests. Corn borer control period is: The third generation is about from the end of August to the beginning of September, and can use 50 ml of triazophos per acre and 2.5% of the enemy to kill 20 ml and spray 40 kg of water. The fourth generation is about 0.75 kg of phoxim granules and insecticidal double granules per acre in the middle-to-late September, and 15 kg of fine soil is placed in corn horns; or kill 20 ml with 100 ml of BT emulsion. Watering 40 kg of spray can also be used triazophos 50 ml plus the enemy to kill 20 ml of watered 40 kg spray. If pests of the armyworm and noctuid moth are found, they should be sprayed with the above-mentioned agents, depending on the occurrence of insect pests. In the tasseling period of corn, aphids were killed with 10 milligrams of heroin per acre and 20 milliliters of enemies, or 10 grams of anticonvulsions and 30 milligrams of water were mixed with the enemy to kill 30 milliliters of water. The upper part of the plants was sprayed and then treated again 10 days later. In the late rainy days, corn sheath blight occurs. When the disease rate in the field reaches 15%, the mannomycin powder is diluted to 45-60 kg per acre and sprayed in the middle and lower leaves of the plant. Drug control once.
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